Mr. Cooper Is Super!: My Weirdest School, Book 1

This school is the weirdest! Mr. Granite is leaving! That means there's going to be a new third-grade teacher. But Mr. Cooper is even weirder than Mr. Granite. He thinks the best way to teach is to come to school disguised as a superhero. What happens when a real superhero is needed? Will Mr. Cooper protect the school from evil or just embarrass it to death?